1993 Chevrolet Corvette Owner's Manual - Page 254

Engine 0il.Addifives When to Change Engine Oil Don't add anything your oil.>Your to Substitute Oil (LTI Engine Only) Chemolet dealer is ready ,'se if to ad When adding .oilto maintain engine oil you think something shouldbe I,added. level, if an oil meeting GM St.aidard GM4718M is not available, youcan use oil designated either S A E 5W-30 API Service SG at all temperatures, or SAE 1OW-30 API Service SC at temperatures above 0°F (-18°C):This oil should not be used foran oil change. Substitute.01 (LTSEngine Only) When addingoil to maintain engine oil level, if an oil meeting GM Standard GM4718M is not available, you can use oil designated.SAE 1OW-30 API Service SG at all temperatures. T i oil should hs not be usedfor an oil change. a See if my one of these is true !€or-you: Most trips are lessthan 4 miles (6 lm). It's below freezing outside and most trips are less than 10 miles (16 km) . TEie engine isat low speed mostof the time (as in stop-and-go traEc). Most trips are through dusty places. I any oneof these is true for your f vehicle, you needto change your oil and filter every 3,000 miles (5 000 km) or 3 months-whichever comes first. (Seethe Index under Engine Oil LifeMonitor.) If none of them.is true, change the oil every 7,500 miles (12 500 lun) or 12 months-whichever comes first. Change the filter at the first oil change and at every other oil change after that. (See the Index under Engine Oil Life Monitor.)